Woodward 5441-695 Relay Output Module for MicroNet Systems

Overview

The 5441-695 Relay Output Module is a discrete output interface designed by Woodward for use in safety-critical and mission-essential control architectures. It converts low-level controller commands into electrically isolated relay signals, allowing secure operation of external devices such as shutdown solenoids, alarm circuits, and control interlocks.

This module is commonly deployed within Woodward MicroNet and MicroNet Plus platforms, where deterministic response, electrical isolation, and long service life are mandatory.

Functional Characteristics

The 5441-695 provides multiple independent relay channels that support both normally open and normally closed logic, enabling flexible configuration for permissive, alarm, and trip functions. Each output channel is electrically isolated from the control electronics, reducing the risk of fault propagation from field wiring back into the controller.

Relays are designed for frequent switching under industrial loads and include internal measures to mitigate contact wear when driving inductive devices.

Relay Output Specifications

The module contains sixteen discrete relay outputs intended for direct control of field equipment. Each channel uses a Form-C contact arrangement, allowing the output state to be defined as fail-safe or energized-to-trip depending on application requirements.

Typical supported loads include solenoid valves, pilot relays, annunciators, and auxiliary contactors used in turbine and generator sequencing systems.

Electrical Parameters

Relay coils operate from a nominal 24 VDC internal supply derived from the control system. Contact ratings are suitable for low-to-moderate power switching in both resistive and inductive circuits. Integrated arc suppression and galvanic isolation improve reliability in electrically noisy environments and extend relay service life.

System Integration

The 5441-695 is designed as a plug-in module for Woodward rack-based control systems. Field connections are made through industrial terminal blocks, while communication with the controller is achieved via a dedicated backplane or ribbon interface, depending on the rack configuration.

This architecture allows rapid replacement without disturbing field wiring, supporting reduced downtime during maintenance.

Mechanical and Environmental Design

The module is built on an industrial-grade printed circuit board with sealed electromechanical relays. Passive cooling is sufficient under normal operating conditions, eliminating the need for forced airflow. Mechanical construction supports operation in environments subject to vibration and continuous duty.

Compatibility

The 5441-695 is compatible with the following Woodward platforms:

MicroNet Simplex
MicroNet Plus
Select Woodward digital turbine and engine control systems

Typical Applications

This relay output module is widely used in applications where deterministic control and electrical isolation are required, including:

Gas and steam turbine protection systems
Engine and compressor control panels
Generator sequencing and auxiliary control
Emergency shutdown and interlock logic

FAQ

Q: Is the 5441-695 suitable for safety shutdown circuits?
A: Yes. The module’s isolated Form-C relay outputs allow fail-safe wiring practices commonly used in turbine and generator shutdown systems.

Q: Can this module directly drive solenoid valves?
A: It is commonly used for solenoid actuation, provided the load is within the relay contact rating specified by the system design.

Q: Does it require external cooling?
A: No. The module is designed for passive cooling in standard Woodward control racks.

Technical Specifications

Manufacturer
Woodward

Model
5441-695

Module Category
Relay Output Module

Number of Outputs
16 independent relay channels

Contact Configuration
Form-C (changeover contacts)

Isolation
Galvanic isolation between control logic and field circuits

Nominal Coil Voltage
24 VDC

Mounting
Plug-in module for Woodward rack systems

Cooling Method
Passive

Operating Environment
Industrial, continuous-duty, vibration-tolerant